/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.http.impl;

import java.util.HashMap;

import org.apache.http.HttpConnectionMetrics;
import org.apache.http.io.HttpTransportMetrics;

/**
 * Default implementation of the {@link HttpConnectionMetrics} interface.
 * 
 * @since 4.0
 */
public class HttpConnectionMetricsImpl implements HttpConnectionMetrics {

	public static final String REQUEST_COUNT = "http.request-count";
	public static final String RESPONSE_COUNT = "http.response-count";
	public static final String SENT_BYTES_COUNT = "http.sent-bytes-count";
	public static final String RECEIVED_BYTES_COUNT = "http.received-bytes-count";

	private final HttpTransportMetrics inTransportMetric;
	private final HttpTransportMetrics outTransportMetric;
	private long requestCount = 0;
	private long responseCount = 0;

	/**
	 * The cache map for all metrics values.
	 */
	@SuppressWarnings("rawtypes")
	private HashMap metricsCache;

	public HttpConnectionMetricsImpl(
			final HttpTransportMetrics inTransportMetric,
			final HttpTransportMetrics outTransportMetric) {
		super();
		this.inTransportMetric = inTransportMetric;
		this.outTransportMetric = outTransportMetric;
	}

	/* ------------------ Public interface method -------------------------- */

	@Override
	public long getReceivedBytesCount() {
		if (this.inTransportMetric != null) {
			return this.inTransportMetric.getBytesTransferred();
		} else {
			return -1;
		}
	}

	@Override
	public long getSentBytesCount() {
		if (this.outTransportMetric != null) {
			return this.outTransportMetric.getBytesTransferred();
		} else {
			return -1;
		}
	}

	@Override
	public long getRequestCount() {
		return this.requestCount;
	}

	public void incrementRequestCount() {
		this.requestCount++;
	}

	@Override
	public long getResponseCount() {
		return this.responseCount;
	}

	public void incrementResponseCount() {
		this.responseCount++;
	}

	@Override
	public Object getMetric(final String metricName) {
		Object value = null;
		if (this.metricsCache != null) {
			value = this.metricsCache.get(metricName);
		}
		if (value == null) {
			if (REQUEST_COUNT.equals(metricName)) {
				value = new Long(requestCount);
			} else if (RESPONSE_COUNT.equals(metricName)) {
				value = new Long(responseCount);
			} else if (RECEIVED_BYTES_COUNT.equals(metricName)) {
				if (this.inTransportMetric != null) {
					return new Long(
							this.inTransportMetric.getBytesTransferred());
				} else {
					return null;
				}
			} else if (SENT_BYTES_COUNT.equals(metricName)) {
				if (this.outTransportMetric != null) {
					return new Long(
							this.outTransportMetric.getBytesTransferred());
				} else {
					return null;
				}
			}
		}
		return value;
	}

	@SuppressWarnings({ "rawtypes", "unchecked" })
	public void setMetric(final String metricName, Object obj) {
		if (this.metricsCache == null) {
			this.metricsCache = new HashMap();
		}
		this.metricsCache.put(metricName, obj);
	}

	@Override
	public void reset() {
		if (this.outTransportMetric != null) {
			this.outTransportMetric.reset();
		}
		if (this.inTransportMetric != null) {
			this.inTransportMetric.reset();
		}
		this.requestCount = 0;
		this.responseCount = 0;
		this.metricsCache = null;
	}

}
